Repeater for telegraph-lines.



.No. 700,037.- Patentd may 13, I902. J. w. GRAY.

REPEATER FDR TELEGRAPH LINES.-

(Application filed Nbv. 22, 1901.)

(No Model. 2 Sheet-Sheet l;

I F3 N a. ray 5 1% a: I wanna No. 700,037. Patented May I3, 1902.

J. w.. GBAY., REPEATEB FOR TELEGRAPH LINES.

(Application filed Nov. 22, 19.01.) (No Model.) 2 Sheets 8heet 2 mllll I a ows "In: humans PET-5R5 0o. Piemaurncu. WASMINGTDN. m t:v

be completed via batteryB,relay R,conductor 'UNITED STATES PATENT OFFICE.

JOSEPH GRAY, OF FOWVLER, INDIANA.

REPEATER FOR TELEG RAPH-LINES.

, FSPECIFICATION forming part of Letters Patent N 0. 700,037, dated May 13, 1902.

Application filed November 22, 1901. Serial No. 83,295. (No model.)

To all whom, it may concern.-

Be itknown that I, JOSEPH W. GRAY, a citizen of the United States,'residing at Fowler, in the county of Benton andlState of Indiana, have invented new and useful Improvements in Repeaters for Telegraph-Lines, of which the following is a specification.

My invention relates to repeaters for telegraph-lines; and the object of the same is to construct a repeater including two relays in the same circuit constructed and arranged in such a manner that they will not interfere with one another. The novel construction by which this object is attained is fully described in this specification and claimed, and illustrated in the accompanying drawings, forming a part thereof, in which- Figure 1 is a diagrammatic plan of the arrangement of my apparatus, illustrating the principle employed. Fig. 2 is a diagrammatic plan of a second arrangement of apparatus as actually used in an operating system.

The principle of my device will first be explained by referring to Fig. 1, after which the system shown inFig. 2 will be taken up.

As shown in Fig. 1, I employ two relays'a high-resistance relay R and a low-resistance relay R. Suppose the coils 1 of the relay B have a resistance ten times greater than the coils 2 of the relayR. The relay R is provided with a spring 3, adjusted to respond to a weak current throughthe coils 1, and the relay R is provided with a spring 4, adjusted to respond to a strongcurrent through the coils 2. A battery B isconnected to the relay R by a conductor 5 and to a key K by a conductor 6. Thekey K is connected to a resistance-coil 7 by a conductor 8. The resistance of the coil 7 is approximately equal to the resistance of the coils of the relay R. The coil 7 is also connected to the coils l of the relay R by a conductor 9. The opposite end of the coil 7 is connected by a conductor 10 to a key K, which key is connected to the relays B and Rby conductors 11 and 12, re spectively.

The operation of the device aboyeset forth, can now be described. When the key K is closed and-the key K is open, a circuit would 12, relay R, conductors 9 and 8, key K, back to battery. If the key K remains open and justed to respond only to a heavy current.

Now it both keys K and K be closed two circuits will be completed-the first via the relays R and R,the same as before, and the second via the relay R, conductor 12, key K, resistance-coil 7, conductor 8, and thence to battery B. The current will be divided between the two circuits in the inverse proportion to the resistance in them. Therefore the first will receive one-sixth and the second five-sixths of the whole, disregarding the difference in resistance of the linear conductors in the two circuits. The relay Rwill then respond to the operation of either key, provided the other remains closed. If new the key K be opened, then'there is no circuit and neither relay will respond to the operation of key K.

In fitting up a station for regular work I prefer to use a'more complete arrangement of apparatus, such as is shown in Fig. 2. In this arrangement there are two high-resistance relays T and T having armatures 13 and springs 14, adjusted to respond to a small current. Resistance-coils 15 and 16 are located adjacent to relays T and T respectively, and provided with contact-points 15 and 16, respectively, located to be engaged by the armatures 1301f the rela ys to complete a circuit through them when a circuit is completed through the relay-coils. In addition to the two relays TT I use two low-resistance relays E E placed nearkeys K K respectively, and sounders S S The latter are connected in local circuits with batteries L and L The keys K andK? are situated at widely-separated stations, while the relays T'and T are at an intermediate station. The resistance of each of the relays E and E is about one-tenth of that of the relays T T Batteries H and H are located near the keys K and K respectively,.and are-..connected to said keys by conductors 17 and to resistance-coils 16 and 15 by conductors 18.. The keys K and K are also connected to re lays E and E by conductors 19. The relay T is connected to the armature of the relay T by a conductor 20 and to the relay E by a conductor 21. The relay T is connected to the armature of relay '1" by a conductor 22 and to the relay E by a conductor 23.

In operation when the key K is closed a circuit'will be completed via battery H, key K, rclay E, conductor 21, relay T, conductor 18, and back to battery H. The closing of this circuit will cause the relay '1" to attract its armature and bring it into engagement with the contact-point 15, while the relay E will remain inoperative, owing to there being too much resistance in circuit. Now if key K be closed a circuit will be completed through the relay T but in addition to this a circuit will be completed via battery 11*, conductor 18, resistance-coil l5, contact-point l5, armature 13 of relay T, conductor 22, conductor 23, relay E conductor 19, key K back to battery 11*. The closing of this circuit will operate the relay E since the current is shunted around the relay T normally in circuit and gives the relay E enough current to work it. The key K can then be operated to operate the relays E when the key K is closed, also '1 and E.

By the above arrangement the operator at either station can always tell by means of his local sounder whether his message is being repeated to the distant receiving-station, as this would not be the case unless the circuit including the receiving station was closed.

In case the key K was closed the key K could be operated to operate the relays E, T, and 15?. From the foregoing it is evident that unless one of the keys K K is closed the other cannot be used to repeat.

My repeater is adapted for use on long metallic or grounded lines. its use the line may be divided up into sections.

I do not wish to be limited as to details of construction and arrangement, as these may be modified in many particulars without departing from the spirit of my invention.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

I. In a repeater, the combination of a highresistance relay, a low-resistance relay, a battery, and a key all connected in circuit, a circuit-breaker and a resistance-coil both in shunt around said high-resistance relay, substantially as described.

2. In a repeater, the combination of a lowresistance relay-coil, a high-resistance relaycoil, a battery andafirst key all connected in circuit, a resistance-coil and a circuit-breaker both in shunt around said high-resistance relay, means for operating said circuit-breaker, a second key and a battery all three of the last-mentioned devices included in circuit, substantially as described.

3. In a repeater, the combination ofa lowresistance relay-coil, a first key, a battery and a high-resistance relay all connected in circuit, a resistance-coil and a circuit-breaker both connected in a shunt around said highresistance relay-coil, a local sounder, a battery and a circuit-breaker all three connected in circuit, said circuit-breaker being arranged to be operated by said high-resistance relaycoil, substantially as described.

4. In a repeater, the combination of a first low-resistance relay-coil, a first key, a battery, and a first high-resistance relay-coil all connected in circuit, a resistance-coil and a firstcircuit-breaker both connected in ashunt around said high-resistance relay-coil, a local sounder, a battery and a circuit-breaker all connected in circuit, said last-mentioned circuit-breaker being arranged to be operated by said low-resistance relay-coil, a second key, a battery, and a low-resistance relaycoilall four connected in circuit, said second low-resistance relay-coil being arranged to operate said first circuit-breaker, a second circuit-breaker and a resistance-coil both connected in a shunt around said second highresistance relaycoil, said second circuitbreaker being arranged to be operated by said first high-resistance relay-coil, substantially as described.

5. In a repeater, the combination, of a first low-resistance relay-coil, a first key, a battery, and a first high-resistance relay and all four connected in circuit, a local sounder, a battery and a circuit-breaker all three connected in circuit, said circuit-breaker being arranged to be operated by said low-resistance relay-coil, a resistance-coil and a first circuit-breaker all connected in a shunt around said high-re sistance relay-coil, a second low-resistance relay-coil, a second high-resistance relay-coil, a second key, and a battery all four connected in circuit, said second high-resistance coil being arranged to operate said first circuitbreaker, a second circuit-breaker, and a resistance coil both connected in a shunt around said second high-resistance relaycoil, said second circuit-breaker being arranged to be operated by said first high-resistance relay, a local sounder, a battery and a circuit-breaker, said last-mentioned circuit-breaker being arranged to be operated by said second low-resistance relay-coil, substantially as described.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

JOSEPH \V. GRAY.

\Vitnesses:

CHARLES B. MOKNIGHT, EARNES'I A. CURTIS. 

